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A New Constitutive Model for the High-Temperature Flow Behavior of 95CrMo Steel

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Abstract

The compressive deformation behavior of 95CrMo steel, one of the worldwide used hollow steels, was investigated on a Gleeble-3500 thermo-simulation machine within temperature range of 1073-1323 K and strain rate range of 0.1-10 s−1. Considering the influence of work-hardening, dynamic recovery and dynamic recrystallization, a new constitutive model for high-temperature flow stress was established in this paper. The calculated values predicted by the new constitutive model lie fairly close to the experimental values with a correlation coefficient (R) of generally above 0.99 and an average absolute relative error of 3.00%, proving a good predictability of the new constitutive model. Also, a modified Sellars-Tegart-Garofalo model (STG model) was introduced to verify the precision of the new constitutive model. Compared to the modified STG model, the new constitutive model has a higher accuracy, which implies it is a reliable tool for predicting flow stress at high temperatures not only under equilibrium state, but also under transient deformation conditions. Besides, the new constitutive model was proved still viable in the initial stage of plastic deformation where plastic strain is lower than 0.05.

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Acknowledgments

The authors would like to acknowledge the found supported by the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (Grant Nos. 2012BAE03B01). The authors would like to thank Mr. Yan-Jun Yin and Mrs. Jin Guo for their great help in Gleeble experiments.

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Authors and Affiliations

  1. Collaborative Innovation Center of Steel Technology of USTB, Beijing, 100083, China

    Bao-Sheng Xie, Qing-Wu Cai, Li-Xiong Xu & Ning Zhen

  2. National Engineering Research Center of Advanced Rolling of USTB, Beijing, 100083, China

    Qing-Wu Cai & Yu Wei

Authors
  1. Bao-Sheng Xie
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  2. Qing-Wu Cai
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  3. Yu Wei
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  4. Li-Xiong Xu
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  5. Ning Zhen
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Correspondence to Bao-Sheng Xie or Qing-Wu Cai.

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Xie, BS., Cai, QW., Wei, Y. et al. A New Constitutive Model for the High-Temperature Flow Behavior of 95CrMo Steel. J. of Materi Eng and Perform 25, 5127–5137 (2016). https://doi.org/10.1007/s11665-016-2388-6

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  • DOI: https://doi.org/10.1007/s11665-016-2388-6

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